14.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Goddard Space Flight CenterUS361 papers
- Marshall Space Flight CenterUS357 papers
- Centre National de la Recherche ScientifiqueFR280 papers
- Max Planck Institute for Extraterrestrial PhysicsDE240 papers
- University of Maryland, College ParkUS239 papers
- Universities Space Research AssociationUS214 papers
- Stanford UniversityUS212 papers
- National Institute for AstrophysicsIT196 papers
- University of Rome Tor VergataIT184 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR179 papers
- University of PaduaIT178 papers
- Istituto Nazionale di Fisica Nucleare, Roma Tor VergataIT175 papers
29 papers · 1 filter
SW Sextantis in an excited, low state
Paul J Groot, Rene' G. M. Rutten, Jan van Paradijs
We present low-resolution spectrophotometric optical observations of the eclipsing nova-like cataclysmic variable SW Sex, the prototype of the SW Sex stars. We observed the system…
EUV and soft X-rays from clusters of galaxies - the `cluster soft-excess' phenomenon
Max Bonamente, Richard Lieu
Clusters of galaxies are strong emitters of EUV and soft X-rays substantially in excess of the contribution from the hot intra-cluster medium at X-ray temperatures. After the initi…
Galaxy Cluster Gas Mass Fractions from Sunyaev-Zel'dovich Effect Measurements: Constraints on Omega_M
Laura Grego, John E. Carlstrom, Erik D. Reese +5
Using sensitive centimeter-wave receivers mounted on the Owens Valley Radio Observatory and Berkeley-Illinois-Maryland-Association millimeter arrays, we have obtained interferometr…
Mining Gamma-Ray Burst Data
Jon Hakkila, Richard J. Roiger, David J. Haglin +3
Gamma-ray bursts provide what is probably one of the messiest of all astrophysical data sets. Burst class properties are indistinct, as overlapping characteristics of individual bu…
The EUV excess emission of the Virgo and A1795 clusters - re-observation with in-situ background measurements
Max Bonamente, Richard Lieu, Jonathan P. D. Mittaz
The Virgo and A1795 clusters of galaxies were re-observed by EUVE with {\it in situ} background measurements by pointing at small offsets. Earlier, a similar re-observational strat…
The nature of the bright submillimeter galaxy population: a radio pre-selected sample with I>25
S. C. Chapman, E. Richards, G. Lewis +2
Deep submillimetre surveys have successfully detected distant, star-forming galaxies, enshrouded in vast quantities of dust and which emit most of their energy at far infrared wave…
EUV and X-ray observations of Abell 2199: a three-phase intracluster medium with a massive warm component
Richard Lieu, Max Bonamente, Jonathan P. D. Mittaz
Various independent ways of constraining key cosmological parameters yielded a consensus range of values which indicates that at the present epoch the bulk of the universe's baryon…
VLT identification of the optical afterglow of the gamma-ray burst GRB 000131 at z=4.50
M. I. Andersen, J. Hjorth, H. Pedersen +16
We report the discovery of the gamma-ray burst GRB 000131 and its optical afterglow. The optical identification was made with the VLT 84 hours after the burst following a BATSE det…
Search for Millisecond Periodicities in Type I X-ray Bursts of the Rapid Burster
D. W. Fox, W. H. G. Lewin, R. E. Rutledge +8
We have searched the rising portion of type I X-ray bursts observed from the Rapid Burster with the Rossi X-ray Timing Explorer for the presence of periodicities. The 95 per cent c…
VLT spectroscopy of GRB 990510 and GRB 990712; probing the faint and bright end of the GRB host galaxy population
P. M. Vreeswijk, A. Fruchter, L. Kaper +15
We present time-resolved optical spectroscopy of the afterglows of the gamma-ray bursts GRB 990510 and GRB 990712. Through the identification of several absorption lines in the fir…
The multiphase nature of the intra-cluster medium of some clusters of galaxies
Max Bonamente, Richard Lieu, Jonathan P. D. Mittaz
The discovery of EUV and soft X-ray excess emission in clusters of galaxies (the cluster soft-excess phenomenon) challenged the notion of the hot ( K) gas as the onl…
An Unusual Burst from Soft Gamma Repeater SGR 1900+14: Comparisons with Giant Flares and Implications for the Magnetar Model
Alaa I. Ibrahim, Tod E. Strohmayer, Peter M. Woods +6
The Soft Gamma Repeater SGR 1900+14 entered a remarkable phase of activity during the summer of 1998. This activity peaked on August 27, 1998 when a giant periodic gamma-ray flare…
GRB990712: First Indication of Polarization Variability in a Gamma-ray Burst Afterglow
E. Rol, R. A. M. J. Wijers, P. M. Vreeswijk +9
We report the detection of significant polarization in the optical afterglow of GRB990712 on three instances 0.44, 0.70 and 1.45 days after the gamma-ray burst, with (P, theta) bei…
Relativity as the quantum mechanics of space-time measurements
Richard Lieu
Can a simple microscopic model of space and time demonstrate Special Relativity as the macroscopic (aggregate) behavior of an ensemble ? The question will be investigated in three…
Harmonically dancing space-time nodes: quantitatively deriving relativity, mass, and gravitation
Richard Lieu
The microscopic structure of space and time is investigated. It is proposed that space and time of an inertial observer are most conveniently described as a crystal array ,…
Detailed Analysis of the Pulsations During and After Bursts from the Bursting Pulsar (GRO J1744-28)
Peter M. Woods, Chryssa Kouveliotou, Jan van Paradijs +5
The hard X-ray bursts observed during both major outbursts of the Bursting Pulsar (GRO J1744-28) show pulsations near the neutron star spin frequency with an enhanced amplitude rel…
Timing Noise in SGR 1806-20
Peter M. Woods, Chryssa Kouveliotou, Mark H. Finger +9
We have phase connected a sequence of RXTE PCA observations of SGR 1806-20 covering 178 days. We find a simple secular spin-down model does not adequately fit the data. The period…
Discovery of the optical counterpart and early optical observations of GRB990712
Kailash C. Sahu
We present the discovery observations of the optical counterpart of the gamma-ray burster GRB990712 taken 4.16 hours after the outburst and discuss its light curve observed in the…
The Sunyaev-Zel'dovich Effect in Abell 370
Laura Grego, John E. Carlstrom, Marshall K. Joy +5
We present interferometric measurements of the Sunyaev-Zel'dovich (SZ) effect towards the galaxy cluster Abell 370. These measurements, which directly probe the pressure of the clu…
Searching for periodicities in the MACHO light curve of LMC X-2
C. Alcock, R. A. Allsman, D. R. Alves +23
Using the exceptional long-term monitoring capabilities of the MACHO project, we present here the optical history of LMC X-2 for a continuous 6-yr period. These data were used to i…
Three-Layered Atmospheric Structure in Accretion Disks Around Stellar-Mass Black Holes
S. N. Zhang, Wei Cui, Wan Chen +5
Modeling of the x-ray spectra of the Galactic superluminal jet sources GRS 1915+105 and GRO J1655-40 reveal a three-layered atmospheric structure in the inner region of their accre…
Statistical properties of SGR 1806-20 bursts
Ersin Gogus, Peter M. Woods, Chryssa Kouveliotou +4
We present statistics of SGR 1806-20 bursts, combining 290 events detected with RXTE/PCA, 111 events detected with BATSE and 134 events detected with ICE. We find that the fluence…
Simultaneous Measurements of X-Ray Luminosity and Kilohertz Quasi-Periodic Oscillations in Low-Mass X-Ray Binaries
Eric C. Ford, Michiel van der Klis, Mariano Mendez +4
We measure simultaneously the properties of the energy spectra and the frequencies of the kilohertz quasi-periodic oscillations (QPOs) in fifteen low mass X-ray binaries covering a…
The power spectral properties of the Z-source GX 340+0
Peter G. Jonker, Michiel van der Klis, Rudy Wijnands +6
We present an analysis of ~390 ksec of data of the Z source GX 340+0 taken during 24 observations with the Rossi X-ray Timing Explorer satellite. We report the discovery of a new b…